128492784 has 80 divisors (see below), whose sum is σ = 421520640. Its totient is φ = 36711360.

The previous prime is 128492773. The next prime is 128492803. The reversal of 128492784 is 487294821.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18222 + ... + 24269.

It is an arithmetic number, because the mean of its divisors is an integer number (5269008).

Almost surely, 2^128492784 is an apocalyptic number.

128492784 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

128492784 is an abundant number, since it is smaller than the sum of its proper divisors (293027856).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

128492784 is a wasteful number, since it uses less digits than its factorization.

128492784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42515 (or 42503 counting only the distinct ones).

The product of its digits is 258048, while the sum is 45.

The square root of 128492784 is about 11335.4657601706. The cubic root of 128492784 is about 504.6143302480.

The spelling of 128492784 in words is "one hundred twenty-eight million, four hundred ninety-two thousand, seven hundred eighty-four".